40691599 has 8 divisors (see below), whose sum is σ = 43896272. Its totient is φ = 37497600.

The previous prime is 40691593. The next prime is 40691617. The reversal of 40691599 is 99519604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40691599 - 2⁷ = 40691471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40691593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6424 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (5487034).

Almost surely, 2^40691599 is an apocalyptic number.

40691599 is a deficient number, since it is larger than the sum of its proper divisors (3204673).

40691599 is a wasteful number, since it uses less digits than its factorization.

40691599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 40691599 is about 6378.9967079471. The cubic root of 40691599 is about 343.9549669507.

The spelling of 40691599 in words is "forty million, six hundred ninety-one thousand, five hundred ninety-nine".